Future plans include display of balloon position on a map, and navigation to the balloon position include voice guidance.

The parts are all readily available:

Raspberry Pi V2 (B+ or A+ will also work, but the extra speed is useful)

Raspberry Pi touchscreen display

Hofbauer XtraBag 200 Case, Black

LoRa board for the Pi

Powerbank

2 Micro USB cables

Double-sided tape

Door trim

SMA plug-socket cable

70cm aerial

There are instructions here for building and installing the LoRa gateway. I will post again shortly with instructions on installing the LCARS interface.

I used a Dremel with cutting tool to cut a hole in the case, then stuck the display down with double-sided tape. A length of rubber door insulation was then cut and placed around the display to provide some protection. The powerbank was held down with Velcro, and connected to the Pi and display using short micro USB cables. Finally, a short SMA cable was used so that aerials can be connected externally.

The Pi is set up to auto-start the LoRa gateway and LCARS program. These two programs talk via a socket so that the LCARS UI can display the current payload position: